CVE-2023-30538

Stored Cross-site Scripting via improper sanitization of svg files in Discourse

Description

Discourse is an open source platform for community discussion. Due to the improper sanitization of SVG files, an attacker can execute arbitrary JavaScript on the users’ browsers by uploading a crafted SVG file. This issue is patched in the latest stable and tests-passed versions of Discourse. Users are advised to upgrade. For users unable to upgrade there are two possible workarounds: enable CDN handing of uploads (and ensure the CDN sanitizes SVG files) or disable SVG file uploads by ensuring that the `authorized extensions` site setting does not include `svg` (or reset that setting to the default, by default Discourse doesn't enable SVG uploads by users).

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.12%
Third-Party Advisory github.com
Affected: discourse discourse
Published at:
Updated at:

References

Link Tags
https://github.com/discourse/discourse/security/advisories/GHSA-w5mv-4pjf-xj43 mitigation third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-30538?
CVE-2023-30538 has been scored as a medium severity vulnerability.
How to fix CVE-2023-30538?
To fix CVE-2023-30538, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-30538 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-30538 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-30538?
CVE-2023-30538 affects discourse discourse.
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